If you only provide cleaning services between stays and do not provide other additional services during the guest stay (such as meals or daily maid service), then Schedule E would be the appropriate place to report your rental income and expenses.
Is this also the case if one is doing business as a single-member LLC? I own and operate summer rental cottages and have a similar arrangement: Cleaning only between guests; no maid service, meals or linens provided. My CPAs have always put this income on Schedule C. I asked another CPA about this, and he half-joked that I should start giving towels to my guests just to qualify for Schedule C.